Photo-electrochemical generation of hydrogen using hybrid titanium dioxide nanotubular arrays

M. Misra; K. S. Raja; V. K. Mahajan; S. K. Mohapatra

doi:10.1117/12.679647

11 September 2006 Photo-electrochemical generation of hydrogen using hybrid titanium dioxide nanotubular arrays

M. Misra, K. S. Raja, V. K. Mahajan, S. K. Mohapatra

Proceedings Volume 6340, Solar Hydrogen and Nanotechnology; 63400I (2006) https://doi.org/10.1117/12.679647
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

Anodization of Ti in acidified fluoride solution resulted in a vertically oriented and an ordered nanotubular titanium oxide surface. Annealing of the TiO2 nanotubular arrays in a carbonaceous or nitrogen containing atmosphere presumably resulted in band-gap states, which enhanced the photo-activity. Composite electrode of nanotubular TiO2 + carbon doping resulted in a photocurrent density of more than 2.75 mA/cm2 at 0.2 V(Ag/AgCl) under simulated solar light illumination. The enhanced photo-activity of the carbon-modified nanotubular TiO2 is highly reproducible and sustainable for longer duration. The charge carrier densities, calculated based on the Mott-Schottky analyses, were in the range of 1-3 x 1019 cm-3 for both the carbon modified and the nitrogen-annealed nanotubular TiO2 samples. The asanodized and oxygen-annealed samples showed a charge carrier density of 5 x 1017 and 1.2 x1015 cm-3 respectively. In this study, the measured photo current density was not directly related to the charge carrier densities of the nanotubes. Presence of different phases, such as amorphous, anatase and rutile, influenced the photo activity more than the charge carrier density.

Citation Download Citation

M. Misra, K. S. Raja, V. K. Mahajan, and S. K. Mohapatra "Photo-electrochemical generation of hydrogen using hybrid titanium dioxide nanotubular arrays", Proc. SPIE 6340, Solar Hydrogen and Nanotechnology, 63400I (11 September 2006); https://doi.org/10.1117/12.679647

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available